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authorJason Low <jason.low2@hp.com>2015-04-28 23:00:24 +0300
committerIngo Molnar <mingo@kernel.org>2015-05-08 13:17:46 +0300
commit7110744516276e906f9197e2857d026eb2343393 (patch)
treee9add9fbd4c901ed5b004e630370df515c6f1210 /kernel/sched/stats.h
parent971e8a985482c76487edb5a49811e99b96e846e1 (diff)
downloadlinux-7110744516276e906f9197e2857d026eb2343393.tar.xz
sched, timer: Use the atomic task_cputime in thread_group_cputimer
Recent optimizations were made to thread_group_cputimer to improve its scalability by keeping track of cputime stats without a lock. However, the values were open coded to the structure, causing them to be at a different abstraction level from the regular task_cputime structure. Furthermore, any subsequent similar optimizations would not be able to share the new code, since they are specific to thread_group_cputimer. This patch adds the new task_cputime_atomic data structure (introduced in the previous patch in the series) to thread_group_cputimer for keeping track of the cputime atomically, which also helps generalize the code. Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Jason Low <jason.low2@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rik van Riel <riel@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Mike Galbraith <umgwanakikbuti@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Waiman Long <Waiman.Long@hp.com> Link: http://lkml.kernel.org/r/1430251224-5764-6-git-send-email-jason.low2@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/stats.h')
-rw-r--r--kernel/sched/stats.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index c6d1c7da3ea5..077ebbd5e10f 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -216,7 +216,7 @@ static inline void account_group_user_time(struct task_struct *tsk,
if (!cputimer_running(tsk))
return;
- atomic64_add(cputime, &cputimer->utime);
+ atomic64_add(cputime, &cputimer->cputime_atomic.utime);
}
/**
@@ -237,7 +237,7 @@ static inline void account_group_system_time(struct task_struct *tsk,
if (!cputimer_running(tsk))
return;
- atomic64_add(cputime, &cputimer->stime);
+ atomic64_add(cputime, &cputimer->cputime_atomic.stime);
}
/**
@@ -258,5 +258,5 @@ static inline void account_group_exec_runtime(struct task_struct *tsk,
if (!cputimer_running(tsk))
return;
- atomic64_add(ns, &cputimer->sum_exec_runtime);
+ atomic64_add(ns, &cputimer->cputime_atomic.sum_exec_runtime);
}